SharpUnhooker
C# Based Universal API Unhooker - Automatically Unhook API Hives (ntdll.dll, kernel32.dll, advapi32.dll, and kernelbase.dll). SharpUnhooker helps you to evades user-land monitoring done by AVs and/or EDRs by cleansing/refreshing API DLLs that loaded on the process (Offensive Side) or remove API hooks from user-land rootkit (Defensive Side). SharpUnhooker can unhook EAT hooks, IAT hooks, and JMP/Hot-patch/Inline hooks. SharpUnhooker also equipped with AMSI and ETW patcher to break/disable them.
This tool is tested on Windows 10 v21H2 x64
Note
- If you want to copy the code, Please dont forget to credit me.
- If you want to see a good demonstration of SharpUnhooker, go check this blog post by Reigada.
- Github doesn't like my Sublime Text indentation settings, so if you see some "weirdness" on the indentation, Im sorry.
Usage
Simply load the pre-compiled DLL or add the code function and call the Main function from the SharpUnhooker class.
You can load the pre-compiled DLL on Powershell with Reflection.Assembly too!
This code uses C# 5,so it can be compiled with the built-in CSC from Windows 10.
The JMPUnhooker function is used to unhook JMP/Hot-patch/Inline hooks, the EATUnhooker function is used to unhook EAT hooks, and the IATUnhooker function is used to unhook IAT hooks. For now, the IATUnhooker and EATUnhooker cant unhook function import/export that uses ordinals instead of name. The Main function is basically "wrapper" of all of the functionality of SharpUnhooker.
If you want to test the capability of SharpUnhooker, you can use the UsageExample function from SUUsageExample class. Its just a simple local shellcode injector.
SharpUnhooker's Main function in action!
To-Do List
- Add function ordinals ability on EATUnhooker and IATUnhooker
- Add ability to remove hooks from CLRGuard